Ppm.
[医] 兆比率(百万分之几)
🗣️ 情景例句
Well, it isn't the Watermill Inn,
算了，这不是Watermill Inn，
You are older than I am.
你比我年老。
Hoping you will be caught and called a thief.
希望你被抓住，被人叫做小偷。